本文整理匯總了VB.NET中System.Windows.Forms.ListView.RetrieveVirtualItem事件的典型用法代碼示例。如果您正苦於以下問題：VB.NET ListView.RetrieveVirtualItem事件的具體用法？VB.NET ListView.RetrieveVirtualItem怎麽用？VB.NET ListView.RetrieveVirtualItem使用的例子？那麽, 這裏精選的事件代碼示例或許可以為您提供幫助。您也可以進一步了解該事件所在類System.Windows.Forms.ListView的用法示例。
在下文中一共展示了ListView.RetrieveVirtualItem事件的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的VB.NET代碼示例。
示例1: Not
'The basic VirtualMode function. Dynamically returns a ListViewItem
'with the required properties; in this case, the square of the index.
Private Sub listView1_RetrieveVirtualItem(ByVal sender As Object, ByVal e As RetrieveVirtualItemEventArgs) Handles listView1.RetrieveVirtualItem
'Caching is not required but improves performance on large sets.
'To leave out caching, don't connect the CacheVirtualItems event
'and make sure myCache is null.
'check to see if the requested item is currently in the cache
If Not (myCache Is Nothing) AndAlso e.ItemIndex >= firstItem AndAlso e.ItemIndex < firstItem + myCache.Length Then
'A cache hit, so get the ListViewItem from the cache instead of making a new one.
e.Item = myCache((e.ItemIndex - firstItem))
Else
'A cache miss, so create a new ListViewItem and pass it back.
Dim x As Integer = e.ItemIndex * e.ItemIndex
e.Item = New ListViewItem(x.ToString())
End If
End Sub